Power-transmitting mechanism.



0. A. GRUBB. POWER TRANSMITTING MECHANISM: APPLICATION man APR.22, ms.

1,296,654. Patented Math, 1919.

awuewtoc had tothe accompanying in driving bicycles, motor stantially auniform speed.

1 UNITED sm'rns PATENT 0mm CRIN A. GBUBB, or WICHITAVFALLS, TEXAS.

rowEnJraAnsi/rrmme MECHANISM.

To all whom it may concern.

Be it known that I, ORIN A.

residing, at the county of Wichita and State of Texas, have inventedcertain new and useful Improvements in Power Transmitting Mechanisms,following is a specification,

drawings.

This invention relates to. an improved power transmitting mechanism, andhas for its primary object to provide simple and effective meansprimarily designed for use cycles and similar. vehicles whereby rotationis transmitted to the driven wheelwithout the use of chains,belts,'gears or analogous elements commonly employed for this purpose.

It is also an additional object of my in- V vention to provide'a'mechanism' for the above purpose whereby a maximum of driving power istransmitted with a minimum expenditure ofenergy, and at sub- Itis a moreparticular object of the in vention to provide a" propelling or drivlngmechanism for bicycles and similar vehicles embodying a sprocket orratchet wheel fixed upon the driven shaft .and relatively movable pawlsto coact with the teeth of; diametrically opposite points to rotate thesame in one direction, means: for actuating the ratchet pawls includingfulcrumed on the vethe ratchet at a yieldable element hicle frame andoperatively connected to the pawls, shaft and coacting' with theyieldable element. V 7

It is a further general object of my invention to provide a powertransmitting mechanism asabove characterized,'the sev- 'eral parts ofwhich are of'very simple constructionand not liable'to get out of order,

efficient and reliable in their operation,.and

' hereinafter capable of manufacture at relatively small cost. .7 I

With the above and other objects invievv, the invention consists in theimproved 'con combination" and relative arw more "fully described,subsequently claimed and illustrated' in the accompanyingdrawings inwhich similar ref- U of which the reference being:

,tends upwardly ina rearward axle'8, a clamping band or: collar 11isengagedyand tothis band, a;

pivotally con A second; band and a cam secured to the pedal Upon theends- 0f the machine frame, a cam meme '7 V ber 19 is suitably secured,each of the cam T I their..; 1 ends in the radially extending faces 21.f

disposed at right angles of the Y faces Patented Mar. 111, 1919;

Application filed April 22, 1918. Seria1No.230,08 3. I i

erence characters designate corresponding 1 parts throughout the severalviews, and WllGlBlIlL v r Figure 1 is a side elevation illustrating oneembodiment of my invention operativelyapplied toa bicycle; v r Fig. 2 isa horizontal sectional view taken on the line 2-2 of Fig. 1;

7 Fig. 3 is an enlarged detall elevation illustrating the action of thecam members upon the spring levers; and

Fig. 4 is a vertical section line 4l'4 of Fig. 1. 7

Referring in detail to the drawing, wherein I have illustrated myimproved. trans mission Vmechanism applied to a bicycle, 5 designatesthe bicycle frame, which-may be .of any ordinary or approvedconstruction,.6 the front wheel of the bicycle, and 7 the rear drivenwheel thereof. 8 designates the crank shaft or axle having an arm 9fixed at each end thereof, equipped with-the usual foot pedal 10. V Uponthe bar of the frame 5, which ex-' taken on the from the crank pair ofspring'levers 12 are nected at one of their ends.

13 is adjustably' clamped upon the frame bar in spaced relation to theband 11,and;

said band 13 carries a fulcrum pinor roller 14. The spring levers theroller 14' and the bar of the frame 5. In

direction 7 12 extend between order to more securely retain the bands 11t and 13 against relative movement on the frame bar, I provide theadditionalbands or rings 15'and 16 respectively, which are adjustablyclamped or otherwise secured and upwardly extend f u on the forwardlyingbar'of the frame 5. These latter bands or collars are'conhected tothe bands 11 and 13 by the rods 17 "and 18 respectively;

crank axle 8, at eachside of the members having oppositely projectin:cam' segments 20, which terminate at one o These radial faceson one cammember are to the radial plane 21 of the othercam member.

formed with, or has secured thereto, an. angularly disposed arm 22in'the end of which an anti-friction roller indicated at, 23 is suitablymounted. This roller is engaged upon the periphery of one of the cammembers, and is preferably flanged at its ends as illustrated so as toprevent the transverse displacement of the roller from the faceofthe-cam.

To the hub of the rear drivenwheel? the spaced ratchet Wheels 24; arefixed, and upon theiwheel axle 7,,a pair of v levers 25, are

,1; loosely engagedintermediate of their ends,

' spective ratchet wheels. Upon the ends of.

said levers being respectively disposedad jacentv to the outer sidefaces of the reeach lever 25, oppositely extending spring pressedpawlsor dogs'26 are mounted, ;said

, To each of the levers 25 adjacent its upper nected, V The other I withtion of the mechanism.

1 12, urges thearm 22"of the lever'outwardly the: axle, and v 40 lever2512:011-

' ,inner side of the pawls being normally urged-into yielding engagementwith the teeth of the ratchet '24.

In the operation of the device, it will be understood that in eachrotation of the crank axle- 8, :the sectors 20 of the respective cammembers 19 coacting with one of the levers or, radially with respect toshifts the upper end of the nectedto the spring lever by the rod27 ina-rearward direction, the pawls 26 moving ,idly on the teeth of theratchet. I/Vhen the arm 22- moves ofii of the peripheral face of thecamsector, said arm is urged inwardly by the tension of the spring leverover the end face21 of the cam sector to the cam. This action occursvery quickly and suddenly, owing to the high tensional pull of thespringleveiz. The movement of the lever% is thus reversed,

the upper end moving forwardly and the lower end rearwardly. In thismovement the pawls 26 are locked with the teeth ofthe ratchet 24 so thatrotation is transmitted to 'thedriven wheel 7. Subsequently the other ofsaid levers 25 is operated in a similar I mannerby one of the sectors ofthe other ing plac at relatively different'times.

cam l9. It will be understood that each cam operatesto cause two suchoperations of the respective' levers 25 in each complete rotation ofthercrank axle,

' Thus, a positive rotative power is transmitted to the driven wheel ofthe vehicle four times 'mitted to the driven wheel 7 eral advantages of,

said operations takin each'revolution of the crank-shaft.- In' his'mannr, I. obtain a. maximum Of? d i g power with a minimum expenditure 'ofenergy, and With relatively slight variation in speed; Intheuse-of myinvention upon bicycles a powerful "driving speed may be transofthe-vehicle, 7 without necessitating the use wheel abovereferredto.However, as I contemplate the use ofthe invention in connecand otherrelatively light vehicles,

of the balance v tion with numerous other machines em-1 pl ycda c iou pipcse ,v som tal sesthi 'ha ce Wh e maybe feundfdje-i V, a 4,8 From heabove sc ip i n. ak nin con: i 9 391 ith h ccomp nying drawing, h

irable,

construction, manner of operation and, .Sev-

clearly and fully understood, The several r st qng, an u able n the rtion, andv not liable to get out- W i I have he i l s ra d pa ticul rform of the operating cams, it is apparent that they are capable ofcertain variations construcof i order.

as ton-size, shape and form without mate- 7 may. affecting the resultsobtained.

I have also herein shown and described pref r d ns ruc ional-1d a rangeen of v th Se e al? "ethere em nt t is che undc te that th p rts lik we,

my. nv ntib-n will be c I p ts smp ye a e 'O e ng y mp emp oy d-b t a,

e s pt ble f consider bl -.-modi ithe ad pta on ft e eria jtc i ifi nt.uses. I therefore reserve the privilege of adoptin all such legitimatechanges as may be, fairly embodied within scope of the invention asclaimed, I claim v In a combination with a driving shaft and a drivenwheel, a ratchet wheel fixed'tothe driven wheel,a spring lever, acainelement power transmission in the spirit and '3 fixedupon thedriving shaft and constantly engaged with'the free end of saidflever,

means operativelyengaged withftheteeth of the ratchet to positivelyrotate the'driven" wheel in onefd'irection, and means operativelyconnecting the last named means to,

v c a. r power transmission mechanism, in v said'spring lever.

2.-I n a combination ,With a' drivingjaxle and a drivenjvheel, a springlever, fulcrum for said lever, a upon the driving shaft and constantlyen gaged with-the free end of said lever to a is fi l cam element. fixed7 move said lever with respect to the fulcrum I and then suddenlyrelease the levervfor movement in and opposite direction, and meansconnected to said lever and operated in therlatter movement thereof totransmit rotation tothedriv'en wheel.

In a power transmission mechanism,in

combination with a driving shaft and a driven wheel, a ratchet fixed tothe driven wheel, a relatively movable lever, a pawlco @acting with theteeth of the ratchet'in the movement of the leverin one'direction torotate the driven wheel, a cam member-fixed upon the driving shaft, aspring lever having an angular arm at all times operatively engaged withthe periphery of the cam spring spring ing an angular arm operativelyengaged the cam member with the periphery of whereby the lever is movedin one direction in the rotation of the cam and placed under tension,and then suddenly released for movement in an opposite direction, saidspring lever being pivotally mounted at one of its ends, an ad ustablefulcrum engaged by ithe lever at a point intermediate of its ends,spring lever to the ratchet lever;

5. In a driving mechanlsm for bicycles and the like, in combination witha driving shaft and a driven wheel, a pair of ratchets fixed to thedriven wheel, pawls coacting with the respective ratchets to rotate thedriven wheel in one direction, members fixed upon the driving shaft andhaving radially the cam portlons' projecting cam portions, of therespective members extending-at right angles to each other, a pair ofspring le vers coacting at their'free ends with the respective cammembers, and means operatively connecting said levers to the respec-'tive ratchet pawls.

6. In a driving mechanism for bicycles and the like, in combination withadriving shaft and a driven wheel, a pair of ratchets fixed to thedriven wheel, pawls coacting with the respective ratchets to rotate thedriven wheel in one direction, members fixed upon the drlving shaft andhaving radially projecting cam portions,ithe cam portions of therespective members extending at right angles to each other, a pair oflovers coacting at their free ends with the respective cam members, acommon adjustable fulcrum for the spring levers mounted upon the vehicleoperatively connecting said levers to the respective ratchet pawls. i j

7. In a driving mechanism for bicycles and the like, in combination witha driving shaft and a drivenwheel, a pair of ratchets and then suddenlyre-' an opposite direc and means operatively connecting the an actuatingelement fixed to the driving end of said spring lever and: said firstnamed lever, crum member adjustable relative to the frame, and meansfixed to the driven wheel, pawls coacting with the respective ratchetsto rotate the driven Wheel in one direction, members fixed upon thedriving projectingcam portions, the cam portions of shaft and havingradially the respective members extending at right 7 anglesto eachother, a pair of spring levers coacting at their free ends With therespective cam members, a collar engagedupon the vehicle frame to whichthe spring levers are pivotally connected at: their other ends, a commonadjustable fulcrum engaging. the levers intermediate of their ends, andmeans mounted upon the frame and connected to said collar and fulcrum toprevent relative shifting movement of said collar and fulcrum. V

8. In a power transmission mechanism, in combination with a drivingshaft and a driven wheel, a ratchet fixed to'the driven wheelf'arelatively movable lever, a pawl carried by the lever and coacting withthe ratchet in the movement of the lever in one c direction to rotatethe driven wheel, a

spring lever pivotally mounted at one of' its ends, an actuating elementfixed to the driving shaft and constantly engaged with'the other end ofsaid spring lever, and an op erative connection between the latter endof the spring lever and said first named lever.

9. In a power transmission mechanism, in combination with 'a drivingshaft and a driven wheel, a ratchet fixed to the driven wheel, arelatively movable lever, a pawl carried by the lever and coacting withthe ratchet in the movement of the lever in one direction to rotate thedriven wheel, a spring lever pivotally mounted at one of its jends,

shaft and constantly engaged with the other lever, an operative con*nection between the latter end of the spring and a fulspring lever andcoacting with said lever intermedlate of its ends.

l0.-In a driving mechanism for bicycles 7 and the like, in combinationwitha driving shaft and a driven wheel, a pair of ratchets fixed to thedriven wheel, pawls coacting with the respective ratchets to drivenWheel in one direction, spring levers,

for the levers erative connection a pair of between the other end ofsaidlevers and the respective ratchets, and vactuating elements fixed uponthe driving shaft and coacting' with-the free ends of therespectivelevers.

11,111 a dr vlngmechanism for bicycles rotate the I,

a 'common pivot mounting at one of their ends, an opa and thelike', incombination with a driving 1 shaft and a driven wheel, a pair ofratchets V fixed to thedrivenwheel, pawls coacting with the respectiveratchets to rotate the driven wheel in one direction, a pair'fo'spring-levers, a common pivot mounting for shaft and coacting with thefree ends of the the levers at one of their ends,' an operativerespective levers. v r r 10 connection between the other end of said Intestimony whereof I hereunto aflix my. levers and the respectiveratchets; adjustsignature in the presence of tWo Witnesses. able fulcrummeans for the levers mounted ORIN A; GRU'BB. upon the vehicle frame andshiftable rela- Witnesses: V tiveto the ivoted ends of said levers randMARY FOSTER,

V actuating he ements fixed upon the driving MINNIE POE.

Copies of this patent may be obtained for five cents each, by addressingthe Gommissjoner of I' atents,

Y Washington, D. C. i i

